Kate and Jon Gosselin’s kids are all grown up! On Sunday, May 11, Kate shared a series of photos on Instagram featuring four of the pair’s sextuplets — Alexis, Aaden, Leah, and Joel — as they celebrated their 21st birthday. “And just like that, they turned 21! Happy Birthday to my 6! ❤️❤️❤️❤️❤️❤️ #GosselinSextuplets” she […]